{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,16]],"date-time":"2026-10-16T18:33:32Z","timestamp":1792175612417,"version":"4.4.0"},"reference-count":44,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2022,11,28]],"date-time":"2022-11-28T00:00:00Z","timestamp":1669593600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Science and Technology Council of Taiwan","award":["MOST 111-2113-M-143-002"],"award-info":[{"award-number":["MOST 111-2113-M-143-002"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Biosensors"],"abstract":"<jats:p>Sodium alginate (SA) was used to functionalize the surfaces of silver nanoparticles (AgNPs) to form SA-AgNPs for sensing dimethoate with a rapid and sensitive visual readout. UV\u2013Vis spectrophotometry, Fourier transform infrared spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and zeta potential measurements were used to characterize SA-AgNPs that were synthesized under the ideal conditions. SA-AgNPs were spherical with an average size of 14.6 nm. The stability of SA-AgNPs was investigated with changes in pH, salinity, and storage time. This colorimetric assay of dimethoate relied on the change in the absorption ratio (A475\/A400) of SA-AgNPs, resulting in their aggregation caused by dimethoate, leading to a visual change for SA-AgNPs from yellow to pale yellow. As a result, the absorption ratio (A475\/A400) of SA-AgNPs showed good linearity in the range of 0.05 to 2.0 ppm (R2 = 0.9986) with a limit of detection (LOD) of 30 ppb. Adding other pesticides did not significantly change the absorption ratio of SA-AgNPs, indicating its high selectivity as a colorimetric assay. The sensor was successfully used to detect dimethoate in actual water samples.<\/jats:p>","DOI":"10.3390\/bios12121086","type":"journal-article","created":{"date-parts":[[2022,11,28]],"date-time":"2022-11-28T01:58:46Z","timestamp":1669600726000},"page":"1086","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Sodium-Alginate-Functionalized Silver Nanoparticles for Colorimetric Detection of Dimethoate"],"prefix":"10.3390","volume":"12","author":[{"given":"Feng-Zuo","family":"Zhou","sequence":"first","affiliation":[{"name":"Department of Applied Science, National Taitung University, Taitung 950309, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yung-Hsiang","family":"Chang","sequence":"additional","affiliation":[{"name":"Institute of Biochemical and Biomedical Engineering, National Taipei University of Technology, Taipei 106344, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cho-Chun","family":"Hu","sequence":"additional","affiliation":[{"name":"Department of Applied Science, National Taitung University, Taitung 950309, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6297-7883","authenticated-orcid":false,"given":"Tai-Chia","family":"Chiu","sequence":"additional","affiliation":[{"name":"Department of Applied Science, National Taitung University, Taitung 950309, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,11,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2919","DOI":"10.1021\/acs.est.0c06405","article-title":"Widespread occurrence of pesticides in organically managed agricultural soils\u2014The ghost of a conventional agricultural past?","volume":"55","author":"Riedo","year":"2021","journal-title":"Environ. 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